CN102789381A

CN102789381A - Method for achieving digital televisions in accordance to digital video broadcasting (DVB) standards in Andriod system

Info

Publication number: CN102789381A
Application number: CN2011104602586A
Authority: CN
Inventors: 高志平
Original assignee: 浙江创佳数字技术有限公司
Priority date: 2011-12-31
Filing date: 2011-12-31
Publication date: 2012-11-21

Abstract

The invention discloses a method for achieving digital televisions in accordance to DVB standards in an Andriod system. The method is characterized by comprising the following steps: using a socket mode to achieve digital television functions in a second layer of the Andriod system; and providing the digital television functions achieved in the second layer for application programs in a Java application layer through a Java application program interface (API) for calling, achieving digital television functions in a C framework layer by using the socket mode, and providing the digital television functions achieved in the C framework layer for application programs in the Java application layer through the Java API for calling. Accordingly, a large number of digital television related applications can call the Java API directly; the problem that how Java applications achieve digital television software module functions by using a base layer C language through the Java API is solved; and development efficiency and portability of the Java applications are greatly improved.

Description

A kind of DTV method that in the An Zhuo system, realizes meeting the DVB standard

Technical field the present invention relates to the digital television techniques field, relates in particular to a kind of DTV method that in the An Zhuo system, realizes meeting the DVB standard.

Background technology

An Zhuo system (Android) is the title based on the mobile phone operating system of increasing income of Linux platform of Google exploitation; This platform is made up of operating system, middleware, user interface and application software, is the mobile software of first real opening of making for portable terminal.Because the characteristic that it is free, as to increase income, open makes it in short several years, become first operation system of smart phone.Meanwhile, a lot of DTVs and STB manufacturer go after like a flock of ducks to Android, one after another the Android system transplantation on DTV and STB.

But Android is the system that aims at mobile phone development, and its framework does not support numeral to televise.And domestic DTV and STB mainly meet the DVB standard, how in the Android system, increase the support to the DTV that meets the DVB standard, and this is the thing that industry is being inquired into.

Summary of the invention

To above-mentioned technological deficiency, the present invention proposes a kind of DTV method that in the An Zhuo system, realizes meeting the DVB standard.

In order to solve the problems of the technologies described above, technical scheme of the present invention is following:

A kind of DTV method that in the An Zhuo system, realizes meeting the DVB standard; Comprise the steps: in the second layer of An Zhuo system to adopt socket socket mode to realize digital television function, the digital television function of in the 3rd layer, realizing in the said second layer offers the application call of Java application layer through Java API.

Beneficial effect of the present invention is: said method adopts the communication mechanism of Java framework and C framework; Designing one can satisfy the demands and communication means efficiently; Adopted the mode C ccf layer of socket socket to realize digital television function; And offer the application call of Java application layer through Java API at the digital television function that the Java ccf layer is realized the C ccf layer; A large amount of like this DTV related application just can directly be called this Java api interface; Solve Java and used how to pass through the problem that Java API uses the digital television software functions of modules of bottom C language realization, greatly improved the efficient and the portability of Java application and development.

Description of drawings

The frame diagram of Fig. 1 An Zhuo system;

The frame diagram that Fig. 2 realizes for DTV;

Fig. 3 is a synoptic diagram of realizing digital television function in the An Zhuo system.

Embodiment

To combine accompanying drawing and specific embodiment that the present invention is done further explanation below.

To in the Android system, realize digital television function, at first need understand the framework of Android system.As shown in Figure 1, the Android system is divided into four layers:

Ground floor: (SuSE) Linux OS and driving;

The second layer: local framework (being also referred to as the C framework);

The 3rd layer: the Java framework;

The 4th layer: java application.

From (SuSE) Linux OS, first level belongs to kernel spacing, second and third, four levels belong to user's space.The second layer and the 3rd layer are the interfaces of local code layer (C/C++) and Java code layer.Between the 3rd layer and the 4th layer, be the interface of the system API of Android.For the exploitation of Android application program, the 3rd layer and following content are sightless, and only taking into account system API gets final product.

In the second layer of Android system, a Media Framework is arranged, this Media Framework is used for supporting multimedia exactly.But this Media Framework does not support the DTV of DVB standard.

The general composition of DTV is seen Fig. 2, and it comprises Tuner, Demodulator, Demux, Decoder, these five parts of Video Presentation.Tuner partly is responsible for becoming intermediate-freuqncy signal to high-frequency signal; Demodulator is responsible for an intermediate-freuqncy signal rectification; The Demux part then is to come out multiplexing certain program demultiplexing in TS stream; Decoder is responsible for a demultiplexing rear video data decode and becomes image frame data, outputs to each lead-out terminal after mixing through Video Presentation and OSD layer at last, like YPbPr etc.When the user pressed telepilot and prepares to see TV, system need go to control this five parts co-ordination, is presented on programme content on the TV screen then.

As can beappreciated from fig. 3; The present invention adopts the communication mechanism of Java framework and C framework; Adopted mode C ccf layer in the An Zhuo system second layer of socket socket to realize digital television function; And offer the application call of Java application layer through Java API at the digital television function that the Java ccf layer is realized the C ccf layer; A large amount of like this DTV related application just can directly be called this Java api interface, has solved Java and has used how to pass through the problem that Java API uses the digital television software functions of modules of bottom C language realization, has greatly improved the efficient and the portability of Java application and development.

Realize digital television function (this part accomplishes the control to five parts of DTV) at the C of Android system ccf layer, and be exposed to application layer to these functions API, adopt Socket mechanism to communicate by letter between this is two-layer at the Java ccf layer, as shown in Figure 3.Application layer just need not be concerned about the concrete realization of digital television function like this, and the own API that only need call these DTV api functions and Android system just can accomplish digital television function.

This implementation has following advantage: the first, can cooperate with various DTV middlewares preferably.Because DTV need transplant various middlewares, like VOD storehouse, NVOD storehouse, CA storehouse etc., these middlewares are often based on (SuSE) Linux OS, and realize with the C language, so these middlewares can only be placed on the C frame part of Android.Digital television function part of the present invention is also at the C frame part, and the cooperation meeting of therefore following middleware is than being easier to.The second, can adapt to the bottom scheme that each chip producer provides preferably.Because each chip producer all provides the scheme based on Linux, the scheme that chip producer provides is all write with the C/C++ language.The 3rd, help the exploitation at OSD interface.Because the API that all DTVs are relevant is achieved at the Java ccf layer, do the concrete realization that the OSD exploitation need not understood digital television function, directly utilize the API of these API and Android system just can accomplish the OSD interface development.

The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the present invention's design; Can also make some improvement and retouching, these improvement and retouching also should be regarded as in the protection domain of the present invention.

Claims

1. DTV method that in the An Zhuo system, realizes meeting the DVB standard; It is characterized in that; Comprise the steps: in the second layer of An Zhuo system to adopt socket socket mode to realize digital television function, the digital television function of in the 3rd layer, realizing in the said second layer offers the application call of Java application layer through Java API.